Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge

Sigrun Jonasdottir, Katherine Richardson, Michael R. Heath, Anna Ingvarsdottir, Alice Christoffersen, European Union (Funder)

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Distribution and reproduction activity of the calanoid copepod Calanus finmarchicus were studied in the waters between Scotland and Iceland in April 1997 during the expected time of the animals' ascent to surface waters following diapause. Ascent was taking place on both sides of the Iceland-Scotland Ridge, apparently from two separate overwintering centers. The population on the Faroe Shelf (FS) most likely came from the overwintering population in the Faroe Shetland Channel (FSC). Per capita egg production was highest on the FS (> 30 eggs female -1d-1) and lowest in the Iceland Basin (10 eggs female -1d-1). The maximum clutch size recorded was on the FS (145 eggs). As the maximum clutch sizes that females produced were between 40% and 77% (area averages of the station maximum rates) of their size-specific reproduction potential, it is argued that egg production rates were generally food-limited. Chlorophyll a concentrations were, at all but one station, under 1 ugL-1. Chlorophyll-based ingestion could, theoretically, support the observed average egg production rates in the Iceland Basin and on the FS but only about 30% of the observed production at the stations in the East Icelandic Current (EIC). The carbon assimilated through ingestion of phytoplankton, Calanus own eggs andnauplii in the EIC was estimated to be too low to support the frequently observed production of clutches consisting of over 100 eggs. Cannibalism on eggs and nauplii was not likely to have constituted a significant component of dietary carbon intake. However, a combination of feeding and assimilation of reserved lipid remaining from overwintering could be sufficient to explain the observed per capita egg production rates. C. finmarchicus copepod stages 1-3 were only recorded in considerable numbers only on the FS. This suggests higher survival rates of eggs in the shelf waters.
LanguageEnglish
Pages471-489
Number of pages18
JournalDeep Sea Research
Volume55
Issue number4
DOIs
Publication statusPublished - 30 Apr 2008

Fingerprint

Calanus finmarchicus
Iceland
Scotland
egg production
overwintering
egg
clutch size
Copepoda
ingestion
basins
chlorophyll
Calanus
carbon
cannibalism
nauplii
diapause
assimilation (physiology)
surface water
survival rate
phytoplankton

Keywords

  • north atlantic
  • calanus finmarchicus
  • secondary production
  • fatty acids
  • hatching
  • lipid content

Cite this

Jonasdottir, S., Richardson, K., Heath, M. R., Ingvarsdottir, A., Christoffersen, A., & European Union (Funder) (2008). Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge. Deep Sea Research, 55(4), 471-489. https://doi.org/10.1016/j.dsr.2007.12.009
Jonasdottir, Sigrun ; Richardson, Katherine ; Heath, Michael R. ; Ingvarsdottir, Anna ; Christoffersen, Alice ; European Union (Funder). / Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge. In: Deep Sea Research. 2008 ; Vol. 55, No. 4. pp. 471-489.
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Jonasdottir, S, Richardson, K, Heath, MR, Ingvarsdottir, A, Christoffersen, A & European Union (Funder) 2008, 'Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge' Deep Sea Research, vol. 55, no. 4, pp. 471-489. https://doi.org/10.1016/j.dsr.2007.12.009

Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge. / Jonasdottir, Sigrun; Richardson, Katherine; Heath, Michael R.; Ingvarsdottir, Anna; Christoffersen, Alice; European Union (Funder).

In: Deep Sea Research, Vol. 55, No. 4, 30.04.2008, p. 471-489.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge

AU - Jonasdottir, Sigrun

AU - Richardson, Katherine

AU - Heath, Michael R.

AU - Ingvarsdottir, Anna

AU - Christoffersen, Alice

AU - European Union (Funder)

PY - 2008/4/30

Y1 - 2008/4/30

N2 - Distribution and reproduction activity of the calanoid copepod Calanus finmarchicus were studied in the waters between Scotland and Iceland in April 1997 during the expected time of the animals' ascent to surface waters following diapause. Ascent was taking place on both sides of the Iceland-Scotland Ridge, apparently from two separate overwintering centers. The population on the Faroe Shelf (FS) most likely came from the overwintering population in the Faroe Shetland Channel (FSC). Per capita egg production was highest on the FS (> 30 eggs female -1d-1) and lowest in the Iceland Basin (10 eggs female -1d-1). The maximum clutch size recorded was on the FS (145 eggs). As the maximum clutch sizes that females produced were between 40% and 77% (area averages of the station maximum rates) of their size-specific reproduction potential, it is argued that egg production rates were generally food-limited. Chlorophyll a concentrations were, at all but one station, under 1 ugL-1. Chlorophyll-based ingestion could, theoretically, support the observed average egg production rates in the Iceland Basin and on the FS but only about 30% of the observed production at the stations in the East Icelandic Current (EIC). The carbon assimilated through ingestion of phytoplankton, Calanus own eggs andnauplii in the EIC was estimated to be too low to support the frequently observed production of clutches consisting of over 100 eggs. Cannibalism on eggs and nauplii was not likely to have constituted a significant component of dietary carbon intake. However, a combination of feeding and assimilation of reserved lipid remaining from overwintering could be sufficient to explain the observed per capita egg production rates. C. finmarchicus copepod stages 1-3 were only recorded in considerable numbers only on the FS. This suggests higher survival rates of eggs in the shelf waters.

AB - Distribution and reproduction activity of the calanoid copepod Calanus finmarchicus were studied in the waters between Scotland and Iceland in April 1997 during the expected time of the animals' ascent to surface waters following diapause. Ascent was taking place on both sides of the Iceland-Scotland Ridge, apparently from two separate overwintering centers. The population on the Faroe Shelf (FS) most likely came from the overwintering population in the Faroe Shetland Channel (FSC). Per capita egg production was highest on the FS (> 30 eggs female -1d-1) and lowest in the Iceland Basin (10 eggs female -1d-1). The maximum clutch size recorded was on the FS (145 eggs). As the maximum clutch sizes that females produced were between 40% and 77% (area averages of the station maximum rates) of their size-specific reproduction potential, it is argued that egg production rates were generally food-limited. Chlorophyll a concentrations were, at all but one station, under 1 ugL-1. Chlorophyll-based ingestion could, theoretically, support the observed average egg production rates in the Iceland Basin and on the FS but only about 30% of the observed production at the stations in the East Icelandic Current (EIC). The carbon assimilated through ingestion of phytoplankton, Calanus own eggs andnauplii in the EIC was estimated to be too low to support the frequently observed production of clutches consisting of over 100 eggs. Cannibalism on eggs and nauplii was not likely to have constituted a significant component of dietary carbon intake. However, a combination of feeding and assimilation of reserved lipid remaining from overwintering could be sufficient to explain the observed per capita egg production rates. C. finmarchicus copepod stages 1-3 were only recorded in considerable numbers only on the FS. This suggests higher survival rates of eggs in the shelf waters.

KW - north atlantic

KW - calanus finmarchicus

KW - secondary production

KW - fatty acids

KW - hatching

KW - lipid content

U2 - 10.1016/j.dsr.2007.12.009

DO - 10.1016/j.dsr.2007.12.009

M3 - Article

VL - 55

SP - 471

EP - 489

JO - Deep Sea Research

T2 - Deep Sea Research

JF - Deep Sea Research

SN - 0967-0637

IS - 4

ER -

Jonasdottir S, Richardson K, Heath MR, Ingvarsdottir A, Christoffersen A, European Union (Funder). Spring production of Calanus finmarchicus at the Iceland-Scotland Ridge. Deep Sea Research. 2008 Apr 30;55(4):471-489. https://doi.org/10.1016/j.dsr.2007.12.009